Design and synthesis of effective electrocatalysts for oxygen reduction reaction in alkaline environments is critical to reduce energy losses in alkaline fuel cells. We have systematically evaluated new approaches for reducing the Pt content while retaining the activity of a Pt-based catalyst with hydrolytic phases containing hydroxide moieties in addition to metal ions and ligands. We report for the first time architectured organic-inorganic hybrid nanorod catalyst, which is fabricated by solvothermal reaction of K₂MCl₄ (M = Pd, Pt) with picolinic acid (PA) (chelating agent) in the presence of FeCl₂. Excess base produces isostructural coordination M-PA complex to Fe-OH chains. A generic formula can be written as Fe₃PtPd(OH)₂[PA]₈(H₂O)₄. The electrocatalytic activities of the hybrid nanorods are explored for oxygen reduction reaction (ORR) in alkaline medium. The onset potential of ORR is significantly reduced with a positive shift of about 109 mV and twice the reduction current density is observed in comparison with Pt/C with the same mass loading. We believe that this work may lead towards the development of heterodoped organic- inorganic hybrid materials with greatly enhanced activity and durability for applications in catalysis and energy conversion.

中文翻译：

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Fe3PtPd（OH）2 [Picolinic acid] 8（H2O）4杂化纳米棒的一步合成：碱性溶液中氧还原反应的高效稳定电催化剂。

设计和合成用于碱性环境中氧还原反应的有效电催化剂对于减少碱性燃料电池中的能量损失至关重要。我们已经系统地评估了减少Pt含量的新方法，同时保留了基于Pt的催化剂的活性，该催化剂的水解相除金属离子和配体外还包含氢氧化物部分。我们首次报道了结构化的有机-无机杂化纳米棒催化剂，该催化剂是通过在FeCl ₂的存在下，将K ₂ MCl ₄（M = Pd，Pt）与吡啶甲酸（PA）（螯合剂）进行溶剂热反应制得的。过量的碱产生与Fe-OH链的同构配位的M-PA配合物。通用公式可以写为Fe ₃ PtPd（OH）₂ [PA] ₈（H ₂ O）₄。研究了杂化纳米棒在碱性介质中的氧还原反应（ORR）的电催化活性。ORR的起始电势以约109 mV的正向偏移显着降低，并且与相同质量负载下的Pt / C相比，观察到的降低电流密度是两倍。我们相信这项工作可能会导致杂化有机-无机杂化材料的开发，该材料在催化和能量转化中的应用将大大增强活性和耐久性。